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Beautyrest

Beautyrest Black® Series Two 15.5" Medium Mattress

$2,749 $2,449 Sale
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4.63
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Size: Twin XL

The honest verdict: the Series Two Medium is the universal true-medium feel with the Series Two upgrades and none of the extras. At about a 5 out of 10 it suits back, side, and combination sleepers, and over Series One it adds enhanced cooling and a deeper, more contouring comfort layer on a taller 15.5-inch build. If you want the well-rounded Black medium with the Series Two cooling but don't need the Apex Top edge feature, this is the clean pick.

What it's made of, and what that does for you

The build reads from the top down: a Sleep Climate quilting layer over a deeper layer of Beautyrest Gel Memory Foam, all carried on a true-medium Triple-Stranded Pocketed Coil core, tuned to a genuine 5 out of 10.

  • A true medium (about 5/10). The most universal firmness: contour where you press, support where you don't, comfortable across sleep positions.
  • The Series Two cooling step-up. Enhanced cooling and a deeper comfort layer than Series One: more contour, less heat, since a pocketed-coil bed moves more air than all-foam.
  • Triple-Stranded Pocketed Coil core. Individually-wrapped coils carry the support and isolate a partner's movement.
  • A taller 15.5-inch build. More comfort layer than the Series One mediums.
  • Premium Black build, CertiPUR-US certified foams, 10-year limited warranty. The well-rounded medium of the Series Two line.

What you notice lying on it

The first impression is balance. You sink into the comfort layer enough to feel cradled at the shoulder and hip, then the coil core catches you before you bottom out, so your spine stays in line on your back or your side. The Series Two cooling is something you feel rather than read about, as the gel foam and the breathing coils pull heat away instead of trapping it.

Who it suits, and who it doesn't

This is the all-rounder, upgraded. Back and combination sleepers are the natural fit, since a true medium with deeper contour covers the widest range of positions, and side sleepers get enough give at the shoulder and hip. Couples with two different sleep styles tend to land here too, because medium is the safest compromise. If you run warm, the Series Two cooling step-up is aimed squarely at that.

It is not the bed for everyone, and it is better to say so now. If you use the full width or sit on the edge a lot, the Apex Top Medium adds reinforced edge support for more usable surface and a steadier perch. If you want the most accessible Black medium, the Series One Medium is the same true-medium feel without the Series Two upgrades. And if you specifically want plush or firm, medium is the middle, with those models bracketing it.

Living with it

Coming from an older or sagging bed, the difference people notice first is steadiness, since the wrapped coils support each part of you independently rather than moving as one sheet. Measure the 15.5-inch height against your frame and reach for deep-pocket sheets. It is compatible with an adjustable base, and the CertiPUR-US certified foams and 10-year limited warranty are there for the long run.

Why buy it from Mattress Overstock

Locally owned and serving Kentucky since 2012, with five showrooms you can actually walk into, in Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. This is a bed you can come lie on in person before you commit, not just a picture on a screen.

"Medium" feels different bed to bed, and the Series Two cooling is something you feel, not read. Come compare it with the Series One Medium and the Apex Top in your own sleeping position. When you are ready, select your size to see the live Mattress Overstock price. You get a 100-day comfort guarantee; if it's not right, you exchange it for store credit toward any bed of equal or greater value. No cash refund, but no restocking-fee games either. Free local delivery, free setup, and the team hauls your old mattress away. And no one on the floor earns more for steering you up a tier, so the guidance is honest.

Feel the mediums across tiers in the full Beautyrest Black lineup.

Size: Twin XL

What makes this mattress different

The well-rounded Series Two medium

A true 5-out-of-10 medium with the Series Two cooling and comfort step-up: the universal feel, upgraded.

Triple-Stranded Pocketed Coil® core

Individually-wrapped coils carry the support and deliver Black's signature motion separation.

Series Two enhanced cooling

More cooling and a deeper comfort layer than Series One: more contour, less heat.

Taller 15.5-inch build, 10-year warranty

More comfort layer than the Series One mediums, on the premium Black coil core.

The universal medium, with the Series Two cooling step-up
How it's built

The universal medium, with the Series Two cooling step-up

The Series Two Medium runs a deeper Beautyrest® Gel Memory Foam comfort layer (with enhanced Series Two cooling) over the Triple-Stranded Pocketed Coil® core, tuned to a true 5-out-of-10 medium. Over a Series One medium you get more contour and more cooling on a taller build; what you don't get (and don't pay for) is the Apex Top edge reinforcement.

Pocketed coils keep motion separation strong. If edge support matters, the Apex Top Medium adds it; for the entry-tier medium, the Series One Medium. Full range in the Beautyrest Black lineup.

Shop the Beautyrest Black lineup →
Inside the build

What's inside Beautyrest Black

Five layers, engineered together: a cool quilted surface, pressure-relieving gel foam, and the Triple-Stranded Pocketed Coil® core that defines the Black line.

Quilted cover + Sleep Climate™Cool-to-the-touch surface Beautyrest® Gel Memory FoamPressure relief Comfort response foamSmooth transition Triple-Stranded Pocketed Coil®Point-by-point support + motion isolation DualCool™ HD baseStable foundation
Who sleeps best on it

The all-rounder, upgraded

Back and combination sleepers: a true medium with deeper contour suits the widest range of positions.

Couples with different styles: medium is the safest compromise, and the coils keep movement from crossing the bed.

Sleepers who run warm: the Series Two cooling step-up targets exactly that.

Probably not for you if: you want edge support (the Apex Top Medium), the cheapest medium (the Series One Medium), or a plush/firm feel.

Specifications

Height15.5"
FeelMedium
Firmness5 out of 10 (10 = firmest)
ConstructionSleep Climate™ quilting over a deeper Beautyrest® Gel Memory Foam comfort layer and a true-medium Triple-Stranded Pocketed Coil® core: 15.5 inches, medium.
CoolingSeries Two enhanced cooling: Sleep Climate™ quilting and Beautyrest® Gel Memory Foam over a Triple-Stranded Pocketed Coil core that breathes more than all-foam.
Motion isolationExcellent. Triple-Stranded Pocketed Coils move independently, so a partner's movement barely crosses the bed.
Adjustable baseYes, compatible with adjustable bases
CertificationsCertiPUR-US certified foams
Warranty10-year limited warranty
Trial period100 days at Mattress Overstock

Frequently asked questions

How firm is the Series Two Medium?

A true medium, about 5 out of 10, with the Series Two deeper contour and enhanced cooling. Comfortable for back, side, and combination sleepers.

How is it different from the Apex Top Medium?

Same true-medium feel; the Apex Top Medium adds reinforced edge support for more usable surface and a steadier side. If you use the full width or sit on the edge often, the Apex is worth it; otherwise this is the clean medium.

How is Series Two different from Series One?

Enhanced cooling, a deeper comfort layer, and a taller build. The Series One Medium is the same true-medium feel at the more accessible tier.

How do delivery and the comfort guarantee work?

We deliver across Kentucky with our own team, usually next business day when your size is in stock, and we haul the old mattress away. You also get a 100-day comfort guarantee: if the feel isn't right, exchange it for store credit toward any bed of equal or greater value (no cash refund).

Can I see this mattress in person near me?

Yes, and with a mattress, we'd always rather you did. Mattress Overstock is a Kentucky-owned company that has served the state since 2012, with five showrooms you can visit: Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. Come lie on this exact mattress in your own sleeping position before you decide. We deliver free across our Kentucky service area and haul your old mattress away, and because everyone on our floor is paid the same no matter which brand you choose, the guidance you get is honest.

Why buy it from Mattress Overstock

Buy it from people you can actually visit

  • Free local delivery To your home across Central & Eastern Kentucky.
  • Free setup We place and set up your new bed in the room.
  • Free old-mattress haul-away The old one goes out the same day the new one comes in.
100-night trial Sleep on it at home
4.7 from 535 Google reviews · 5 Kentucky showrooms
LexingtonRichmondGeorgetownLondonSomerset

Independently owned in Kentucky since 2012. Walk in any day (no appointment) and someone who actually knows the floor will help you find the right fit.

MO, the Mattress Overstock mascot, pointing the wayStill deciding?

Try it in person at any Kentucky showroom

Walk into any Mattress Overstock location, lie down, and feel the difference yourself. No appointment, no pressure. Our team has over 100 years of combined mattress experience and we're here to help you find the right fit.